rusty blackbird vs rusty grackle

rusty blackbird and rusty grackle both are nouns.

Word	Noun	Adjective	Verb	Adverb
rusty blackbird	Yes	No	No	No
rusty grackle	Yes	No	No	No

As nouns, rusty blackbird and rusty grackle are synonyms defined as:

rusty blackbird and rusty grackle: North American blackbird whose bluish-black plumage is rusty-edged in the fall

Other synonyms of rusty blackbird include Euphagus carilonus.

rusty blackbird (noun)	rusty grackle (noun)
North American blackbird whose bluish-black plumage is rusty-edged in the fall	North American blackbird whose bluish-black plumage is rusty-edged in the fall